SOULNOTE A-2 ver.2 Integrated Amplifier

The output voltage has been intentionally lowered. By doing so, priority is given not to maximum output at 8 Ω, but to the ability to deliver instantaneous current under low-impedance loads. This enhances perceived power and grip, resulting in far more powerfulness and grip.

Relay-switched balanced attenuator

The volume adjustment employs SOULNOTE’s original relay-based attenuator system, which switches high-precision resistors in a balanced configuration. Transparency is dramatically enhanced, allowing the soundstage to emerge with three-dimensional clarity. It also is significantly improved quality in a low volume level without concern for gang error.

The ideal construction

The input terminals, input selector, volume control, and non-feedback voltage amplification stage are all concentrated onto a single multi-layer board. This minimizes the input signal path. Factors contributing to sound quality degradation, such as vibration in connecting cables, inductance components, and the effects of radiated noise, have been eliminated without employing any shielding or filters that could negatively affect the sound. This construction was only achievable through the relay-switching balanced attenuator.

Four-layer board with 70-micron copper foil thickness

Composed of the output stage and the main power supply, the power block features an inner layer of 70-micron thick copper foil substrate inner layer plane as the power supply busbar.

The high-current loop – “rectifier capacitor → output transistor → loudspeaker plus terminals → loudspeaker minus terminals → rectifier capacitor “– is minimized. Eliminating inductance components in the high-current lines creates exceptional frequency response and stability.

Direct wiring without connectors

Connectors have been eliminated in the power supply as well as the signal lines, and cables are instead soldered directly to the boards for direct connections.

Chimney-type heat sink

The heat sink is applied chimney type that pursues a shape with high cooling efficiency and low intrinsic vibration.

Structure for highest sound quality

The entire structure is designed with sound quality as the priority. This includes the floating top cover and unsecured circuit board. Furthermore, the foot positioned directly beneath the power transformer serves to release its vibrations.

Power amplifier mode

This mode interrupts the power supply to the microcomputer and bypasses the selector and volume. This increases the S/N. XLR and RCA inputs can also be selected in this mode.

Four different selectable modes

The following four usage options are available:

• Stereo integrated amplifier
• Bi-amp monaural integrated amplifier
• Stereo power amplifier
• Bi-amp monaural power amplifier